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POWER SYSTEMS

Power Systems
Making and breaking currents of 3 phase AC circuit breakers in power system are respectively in what form?

 RMS and RMS value
 RMS and Instantaneous value
 any of the above
 Instantaneous and RMS value

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Power Systems
In a 220 kV system, the inductance and capacitance up to the circuit breaker location are 25 mH and 0.025 µF respectively. The value of resistor required to be connected across the breaker contacts which will give no transient oscillations, is

 1000 Ω
 250 Ω
 25 Ω
 500 Ω

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Power Systems
Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

 Over current relay
 Buchholz relay
 Over fluxing relay
 Differential relay

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Power Systems
Mho relay is usually employed for protection of

 medium transmission lines only
 any line
 short transmission lines only
 long transmission lines only

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Power Systems
A generating station has a maximum demand of 100 MW, a load factor of 60% and a plant capacity factor of 50%. The reserve capacity of the plant is

 20 MW
 80 MW
 10 MW
 15 MW

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